Answer:
Salt, Gold
Explanation:
These African kingdoms are known as Sahelian, because they were located in the Sahel, the area of grasslands south of the Sahara. Sahelian kingdoms had several things in common, and one of the most important ones was the fact that they were able to control the trade routes that travelled through the desert. This allowed the kingdoms to actively participate in trading, and much of their wealth originated in the trade of salt and gold.
